#ifndef _BEZIER_INCLUDED_#include "vector.h"class Bezier {    public:    point *p0, *p1, *p2, *p3;    Bezier()	{	p0 = 0; p1 = 0; p2 = 0; p3 = 0;	}    Bezier( point *_p0, point *_p1, point *_p2, point *_p3 )	{	p0 = _p0; p1 = _p1; p2 = _p2; p3 = _p3;	}    Bezier * Split( );    void ParameterSplitLeft( double t, Bezier &result );    // Intersect with another curve.  Return two 10-elt arrays. Array 0     // contains fragments of self. Array 1 contains fragments of other curve.    // Fragments continue until one with nil pointers pointing at point data.    Bezier **Intersect( Bezier B );     ~Bezier()	{	if( --p0->refcount <= 0 ) delete p0;	if( --p1->refcount <= 0 ) delete p1;	if( --p2->refcount <= 0 ) delete p2;	if( --p3->refcount <= 0 ) delete p3;	}    };#define _BEZIER_INCLUDED_#endif